{"id":8168,"date":"2013-11-06T13:13:54","date_gmt":"2013-11-06T12:13:54","guid":{"rendered":"https:\/\/dana.ggiants.de\/faq\/how-can-it-be-explained-that-nanoparticles-change-their-optical-properties\/"},"modified":"2024-07-11T09:34:25","modified_gmt":"2024-07-11T07:34:25","slug":"how-can-it-be-explained-that-nanoparticles-change-their-optical-properties","status":"publish","type":"faq","link":"https:\/\/materialneutral.info\/en\/faq\/how-can-it-be-explained-that-nanoparticles-change-their-optical-properties\/","title":{"rendered":"How can it be explained that nanoparticles change their optical properties?"},"content":{"rendered":"<p style=\"text-align: left;\"><em>Question: &#x201C;Why, for example, are titanium dioxide nanoparticles transparent once they have reached a certain size?&#x201D;<\/em><\/p>\n<p style=\"text-align: left;\">This is due to a physical effect. Any object that is clearly smaller than the wavelength of the visible light is invisible. Visible light is composed of wavelengths in the range of approximately 380 &#x2013; 790 nanometers.<\/p>\n<p style=\"text-align: left;\">Particles that measure e.g. 100 nanometers are not visible anymore. This, however, happens only under extraordinary conditions: As soon as several particles are found one in front of or beside the other, they (normally) take on a white color and become visible again due to e.g. diffraction or <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_61e430815d0fc3e6487ab07f0b1503df\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">dispersion<\/span>. In spite of this, not all of the particles&#x2019; chemical and physical properties change at the nanolevel. <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_f6fd8532a825e16b9830f66176590fb3\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">Absorption<\/span> properties, for example, persist i.e., the particles do not reflect light anymore, thus are transparent but actually absorb UV radiation.<\/p>\n","protected":false},"template":"","faq_category":[59],"class_list":["post-8168","faq","type-faq","status-publish","hentry","faq_category-09_material-properties"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How can it be explained that nanoparticles change their optical properties? - MANTRA<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/materialneutral.info\/en\/faq\/how-can-it-be-explained-that-nanoparticles-change-their-optical-properties\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How can it be explained that nanoparticles change their optical properties? 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